Only 20 out of 1,394 jails in the country are exclusively reserved for women and 3,200 out of the overall 16,951 female prisoners of the country are serving their terms in such prisons.
The data also reveals that women staff across jails in the country is less than 25 per cent of the total female inmates' population.
The strength of women jail staff as on December 31, 2012 stood at 3,935, of which 189 worked at official level while 2,543 women are in the jail cadre staff, the data showed.
Besides, 646 women are involved in clerical work in the all-women jails, the data said.
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According to NCRB, 55 female inmates died within prison premises during 2012 of which 47 were reported as "natural deaths" while five as "suicides" and three as a result of "assault by outsiders".
Among the states, Tamil Nadu and Kerala have maximum women prisons, three each, housing 312 and 127 inmates, respectively. Andhra Pradesh, Rajasthan and West Bengal have two women jails each, while Bihar, Maharashtra, Odisha, Punjab, Tripura, Uttar Pradesh and Delhi have one women jail each, the data showed.